Pre-release review of glibc 2.17: 0 P1 bugs, 14 P2 bugs, 0 P3 bugs.

Joseph S. Myers joseph@codesourcery.com
Thu Nov 29 17:42:00 GMT 2012


On Thu, 29 Nov 2012, David Miller wrote:

> > "Removal of sysdeps/x86_64/fpu/s_sincos.S causes regressions"
> > http://sourceware.org/bugzilla/show_bug.cgi?id=14412
> > - No patches.
> > - Real problem though.
> 
> I wish we had a usable fix for this one, but we don't so...

There was speculation for some such issues that changing fesetround so it 
doesn't set the control word if it hasn't actually made any changes to it 
would avoid the overhead from setting round-to-nearest in various 
functions, if the function is called with the FPU already in 
round-to-nearest mode (the common case).  But I'm not sure what benchmarks 
we have for that suggestion.

-- 
Joseph S. Myers
joseph@codesourcery.com



More information about the Libc-alpha mailing list